from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from .models import Post
from .forms import EmailPostForm, CommentForm
from django.shortcuts import render, get_object_or_404
from django.core.mail import send_mail
from taggit.models import Tag
from django.db.models import Count
from django.contrib.postgres.search import SearchVector
from .forms import EmailPostForm, CommentForm, SearchForm
def post_list(request, tag_slug=None):
 posts = Post.published.all()
 tag = None
 if tag_slug:
   tag = get_object_or_404(Tag, slug=tag_slug)
   posts = posts.filter(tags=tag)
 paginator = Paginator(posts, 3)
 page = request.GET.get('page')
 try:
    posts = paginator.page(page)
 except PageNotAnInteger:
    posts = paginator.page(1)
 except EmptyPage:
    posts = paginator.page(paginator.num_pages)
 return render(request, 'blog/post/list.html', {'posts': posts,'page':page,'tag':tag})
#def post_detail(request, year, month, day, post):
 #return render(request, 'blog/post/detail.html')
def post_detail(request, year, month, day, post):
   post = get_object_or_404(Post, slug=post, status='published',
                            publish__year=year,
                            publish__month=month,
                            publish__day=day)
   post_tags_ids = post.tags.values_list('id', flat=True)
   similar_posts = Post.published.filter(tags__in=post_tags_ids).exclude(id=post.id)
   similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
   .order_by('-same_tags','-publish')[:4]
   comment_form = CommentForm()
   comments = post.comments.filter(active=True)
   new_comment = None
   if request.method == 'POST':
      comment_form = CommentForm(data=request.POST)
      if comment_form.is_valid():
         new_comment = comment_form.save(commit=False)
         new_comment.post = post
         new_comment.save()
   else:
      comment_form = CommentForm()
   return render(request, 'blog/post/detail.html', {'post': post, 'comments': comments,'new_comment': new_comment,'comment_form': comment_form,'similar_posts': similar_posts})
#def post_share(request, post_id):
   #return render(request, 'blog/post/share.html')
def post_share(request, post_id):
   post = get_object_or_404(Post, id=post_id, status='published')
   sent = False
   if request.method == 'POST':
      form = EmailPostForm(request.POST)
      if form.is_valid():
         cd = form.cleaned_data
         post_url = request.build_absolute_uri(post.get_absolute_url())
         subject = f"{cd['name']} recommends you read " \
                     f"{post.title}"
         message = f"Read {post.title} at {post_url}\n\n" \
         f"{cd['name']}\'s comments: {cd['comments']}"
         send_mail(subject, message, '1752267569@qq.com',
               [cd['to']])
         sent = True
   else:
        form = EmailPostForm()
   return render(request, 'blog/post/share.html', {'post': post,'form': form,'sent': sent})
def post_search(request):
   form = SearchForm()
   query = None
   results = []
   if 'query' in request.GET:
      form = SearchForm(request.GET)
      if form.is_valid():
         query = form.cleaned_data['query']
         results = Post.published.annotate(
         search=SearchVector('title', 'body')
         ).filter(search=query)
   return render(request,'blog/post/search.html', {'form': form,'query': query,'results': results})


